Chapter 6

1. Symbol tables allow your semantic analysis and code generation phases to quickly look up symbols declared far away in the syntax tree, following the scoping rules of the language.
2. Synthesized attributes are computed using the information located immediately at a node or using information obtained from its children. Inherited attributes are computed using information from elsewhere in the tree, such as parent or sibling nodes. Synthesized attributes are typically computed using a bottom-up post-order traversal of the syntax tree, while inherited attributes are typically computed using a pre-order traversal. Both kinds of attributes are stored in syntax tree nodes in variables added to the node's data type.
3. The Jzero language calls for a global scope, a class scope, and one local scope for each member function. The symbol tables are typically organized in a tree structure corresponding to the scoping rules of the language, with child symbol tables attached...